I think you're living in a bit of a bubble here. Your 'evidence' is a bunch of cherry picking that's hosted on reddit, a left-wing website. You could easily make the same case for twitter, with the caveats that 1) reddit probably wouldn't let you do it 2) you'd dislike the people twitter targets so it'd be less morally objectionable.
You can find plenty of criticism of the the Twitter left. Hell they do it to themselves, especially with incessant purity tests. Jimmy Dore comes comes to mind as well as how he turned on Cenk Uygur and the whole so called "Force the Vote" Fiasco as well as the "Bloody Monday" conspiracy.
r/enough_sanders_spam documents some of their dumb takes but that sub devolves more into bashing anyone to the left of Joe Biden.
As for my personal views,they don't really matter but I try and find hypocrisy in the "eat the rich" crowd as well as the hard right wingers.
Also one other thing that matter is that what the public perceives Parler as. I believe it has been forever associated with the Jan 6 riots and voter fraud allegations, so whether it was instrumental to these things or not does not necessarily matter but the public's perception of them does.
Think Ronald Reagan for example, modern people have a lot of to object about his presidency and many did then as well, but he enjoyed strong approval ratings throughout his presidency. During his reelection campaign, he had many issues while speaking like stuttering etc. but during his second debate with Walter Mondale, he was able to dispel all fears about his age and capabilities almost instantaneously.
